add rake rcov task
add rake rcov task

jusko/rbvmomi,synthead/rbvmomi,10xEngineer/rbvmomi,frapposelli/vagrant-rbvmomi,rlane/rbvmomi,frapposelli/vagrant-rbvmomi,vmware/rbvmomi,omar-infinio/rbvmomi,rapid7/rbvmomi,rapid7/rbvmomi,10xEngineer/rbvmomi,rcorrieri/rbvmomi,jusko/rbvmomi,logankimmel/rbvmomi,rlane/rbvmomi,synthead/rbvmomi